An adverse event (AE) is defined as any untoward medical occurrence in a patient or clinical investigation participant administered a pharmaceutical product which does not necessarily have a causal relationship with this treatment. The investigator assesses the relationship of each event to the use of study drug. A serious adverse event (SAE) is an event that results in death, is life-threatening, requires or prolongs hospitalization, results in a congenital anomaly, persistent or significant disability/incapacity or is an important medical event that, based on medical judgment, may jeopardize the participant and may require medical or surgical intervention to prevent any of the outcomes listed above. Treatment-emergent adverse events/treatment-emergent serious adverse events (TEAEs/TESAEs) are defined as any event that began or worsened in severity on or after the first dose of study drug.

Safety population: all participants who received at least one dose of study drug

Cmax is the highest concentration that a drug achieves in the blood after administration in a dosing interval.

Phase 1 dose escalation and safety expansion participants with available data

Tmax is the the time at which the maximum plasma concentration (Cmax) is observed.

Phase 1 dose escalation and safety expansion participants with available data

AUC is a measure of how long and how much drug is present in the body after dosing.

Phase 1 dose escalation and safety expansion participants with available data

Overall response rate is defined as the percentage of participants with documented best overall response of Partial Response (PR) or better (PR, Very good partial response [VGPR], Complete response [CR], or Stringent complete response [sCR]) per 2016 standard International Myeloma Working Group (IMWG) criteria.

All enrolled Phase 2 participants who received venetoclax and had active disease at baseline; primary efficacy endpoints were pre-specified for Phase 2 only, and are reported for all participants with available data

The percentage of participants with documented best overall response of Very Good Partial Response (VGPR) or better (VGPR, Complete response [CR], or Stringent complete response [sCR]) per 2016 standard International Myeloma Working Group (IMWG) criteria was computed.

All enrolled Phase 2 participants who received venetoclax and had active disease at baseline; primary efficacy endpoints were pre-specified for Phase 2 only, and are reported for all participants with available data

Overall response rate is defined as the percentage of participants with documented best overall response of Partial Response (PR) or better (PR, Very good partial response [VGPR], Complete response [CR], or Stringent complete response [sCR]) per 2011 International Myeloma Working Group (IMWG) criteria.

All enrolled Phase 1 participants who had active disease at baseline and received venetoclax

TTR is defined as the number of days from the date of first dose of study drug until the date of their first favorable response of Partial Response (PR) or better (PR, Very good partial response [VGPR], Complete response [CR], or Stringent complete response [sCR]) per 2011 International Myeloma Working Group (IMWG) criteria (Phase 1) or 2016 IMWG criteria (Phase 2). If a participant did not experience a favorable response, they were to be censored at the date of last adequate assessment. TTR was analyzed by Kaplan- Meier (K-M)\ methodology.

All enrolled participants who received venetoclax, had active disease at baseline, and achieved a response (PR or better)

TTP is defined as the number of days from the date of first dose of study drug to the date of first documented disease progression or death due to multiple myeloma, whichever occurs first. TTP was analyzed by Kaplan- Meier (K-M) methodology.

All enrolled participants who received venetoclax

DOR is defined as the number of days from the date of first response of Partial Response (PR) or better to the date of first documented disease progression or death due to multiple myeloma, whichever occurs first. DOR was analyzed by Kaplan- Meier (K-M) methodology.

All enrolled participants who received venetoclax, had active disease at baseline, and achieved a response of PR or better

PFS is defined as the number of days from the date of the first dose of study treatment to the date of first documented disease progression or death due to any cause, whichever occurs first. PFS was analyzed by Kaplan-Meier methodology.

All enrolled Phase 2 participants who received venetoclax and had active disease at baseline; this endpoint was pre-specified for Phase 2 only, data are reported for all participants with available data

OS is defined as the number of days from the date of the first dose of study drug to the date of death due to any cause. If a participant was not known to have died, OS was censored at the last known alive date. The distribution of OS was estimated using Kaplan-Meier methodology.

All enrolled Phase 2 participants who received venetoclax; this endpoint was pre-specified for Phase 2 only, data are reported for all participants with available data

The BPI-SF is a pain-specific measure developed to assess patient-reported severity (or intensity) of pain (4 items) and the impact of pain on daily functioning (7 items) in patients with cancer pain. The four pain severity items assess pain at its "worst in last 24 hours," "least in last 24 hours," "average," and "now" (current pain). For these items, participants are asked to rate their pain on an 11-point numeric rating scale with anchors of 0 (no pain) and 10 (pain as bad as you can imagine). The Worst Pain scores range from 0 to 10, with higher scores indicating severe pain. Negative changes from baseline indicate improvement.

Intent-to-Treat (ITT) population: all participants who received at least one dose of study drug; participants who have both baseline and post-baseline values are included in the analysis at each visit

The QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including five functional scales (physical, role, emotional, social, and cognitive), three symptom scales (fatigue, nausea and vomiting, and pain), a global health status/quality of life scale, and six single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). For the Physical Functioning scale, participants rate five items on a four-point scale, with 1 as "not at all" and 4 as "very much." The Physical Functioning Scale scores range from 0 to 100 and were calculated per the EORTC QLQ-C30 Scoring Manual (3rd edition), version 3.0. A high scale score represents high/healthy level of functioning. Positive changes from baseline indicate improvement.

Intent-to-Treat (ITT) population: all participants who received at least one dose of study drug; participants who have both baseline and post-baseline values are included in the analysis at each visit

The QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including five functional scales (physical, role, emotional, social, and cognitive), three symptom scales (fatigue, nausea and vomiting, and pain), a global health status/quality of life scale, and six single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). For the Global Health Status/Quality of Life scale, participants rate two items on a seven point scale, with 1 as "very poor" and 7 as "excellent." The Global Health Status/Quality of Life scale ranges from 0 to 100 and was calculated per the EORTC QLQ-C30 Scoring Manual (3rd edition), version 3.0. A high score for the global health status/QoL represents a high QoL. Positive changes from baseline indicate improvement.

Intent-to-Treat (ITT) population: all participants who received at least one dose of study drug; participants who have both baseline and post-baseline values are included in the analysis at each visit

PROMIS Cancer Fatigue SF is a seven item questionnaire that assesses the impact and experience of fatigue over the past 7 days. All questions employ the following five response options: 1 = Not at all, 2 = A little bit, 3 = Somewhat, 4 = Quite a bit, and 5 = Very much. The total raw score is the sum of the responses to each question and is converted to a T-score. The T-score re-scales the total raw score to a standardized score with a mean of 50 and a standard deviation of 10. The [PROMIS] Cancer Fatigue Short Form [SF] 7a T-Scores range from 29.4 to 83.2, with higher scores indicating more fatigue. Negative changes from baseline indicate improvement.

Intent-to-Treat (ITT) population: all participants who received at least one dose of study drug; participants who have both baseline and post-baseline values are included in the analysis at each visit